Improvement in automatic door-bolts



ILPETERS. PHOTu-LITHOGMFMH. WASHINGTON D C mui-19g states I@ stent @with ANGUS MCKAY, OF MONTREAL, CANADA,

a( Letters Patent No. 110,486, dated December 27, 1870.

IMPROVEMENT IN AUTOMATIC DQOR-BOLTS.

The .Schedule referred to in these Letters Patent and making part of the same.

To all whom tt may concern.:

Beit known that I, ANGUS MCK'AY, of the city of Montreal, in the district of Montreal, in the Province of Quebec, in the Dominion of Canada, merchant, have invented new and useful Improvements on Self-acting Flush Safety-Bolts;.and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the saine, reference being had to the annexed drawing,v

Where- Figure I represents anV eleva-tion of a pair of doors arranged with the bolts;

Figure 'II represents an elevation of the inner side of the bolt;

Figure III represents an elevation of the inner edge of the bolt;

' Figure IV represents a sect-ion online A B, Fig. II.

Ihisinvention relates to improvements on self-acting flush safety-bolts for double doors, such as those employed for buildings, closets, cupboards, Ste. These doors, in ordinary use, are. provided with bolts attached to the first-closing leaf', which, after this part ofthe door is shnt,are pushed ont-,entering into recesses at the top and bottom. 'Ihcv otherl door .is provided with the lock, but should the pushing out `of the bolt, by forgetfulness, he neglected in thc first leaf of the door, the locking oi the second door is rendered useless.

By my improved bolt the pushing out of the bolts in the first-closing door is automatically performed by forcing the second lea-f of the door (or thev one provided with the lock) in place. v

In the drawing hereunto annexed similar letters of reference indicate like parts.

Letter t is the first-closing leaf` of a pair of doors, shown in Fig. IV as shut, and provided with niy iml proved bolt at its upper end only, but, if required, it :may be placed on the lower side, or have one at each fend, entering into the upper and lower frame-work of the doorway.

b is the secondeclosing door. By pushing this into position for locking, the bolt or bolts securing the firstmentioned door are automatically operated.

The position of my improved 'holt and its parts are shown ou a small scale in dotted lines in Fig. I in the relative position they will stand in when the doors are closed, and on an enlarged scale in Fig. Il, in the position thc various parts of the eelt-acting bolt will occupy when'the doors are open, inwind-h c is a metal plate, having a flange, d dl, .extending on two of its sides. i

In d* an opening is cut for the inclined end d2 of the bolt f to pass through.

This bou slides ,been and forni in a une at right angles to the iiange d, being guided in its action by the end d2 and by aslot, g, sliding on a screw, g', 1n-

-serted in the plateb, and provided with an enlarged in the flange el, and in the position showuin Fig. II.

rIhe end of theboltt is iush with the upper side of the iiange cl, acting as a guide forl it, while, in the' lower end ot' the bolt lL', a slot, It, is formed, sliding on a screw, l, inserted in the plate c, and serving as a guide to keep the lower end of the bolt in its proper line of action,l at right angles to the boltf.

'Thespring an. is provided and arranged to cause the bolt li to return to the position shown'iu Fig. II, after-it has been forced out, as shown in Fig. I.'

n is a stop-piu for the other `end ofthe spring, auch' if desired, is so placed that it may not only answer this purpose, but also assist in guiding the bolt f by its lower edge resting against it.

Having briefly describedA the construction of vmy invention, I will now describe,itsOperation. l

'lhe corners of the doors to which these bolts are attached are recessed in the same manner as for locks, so that the plate c may he flush with the inner sur face of the door, the flange dl with its edge, and d with its end, leaving room also for the working parts, hereiubefore described, to freely move about in. v

' The plate c issecured to the door with screws, in the ordinary manner.

In the doorway suitable recesses are formed ,to re.- ceive the ends or end of the bolts or bolt t, when it is caused to project beyond the ange d.

'Ilhe door and doorway having 1been thus arranged,

the door a, to which the bolts areiattached, is shut,

or placed so that the bolt t comes under the recess before mentioned iu the doorway. The other door, b, p

is then closed, and, in doing this, its edge pressesf'on the inclined end'dz of the bolt f, causing it to slide in Hush wit-h the flange all. At the same time, the ineline h, acting on the shoulder 11.', causes the bolt i. to bcA pushed out into the receptacle formed to receive it in the doorway, when, by locking the door b in the ordinary way to the door a, bot-h are secured.

liVhen'it is desired to opeuthe doors, it is only necessary to unlock the door b and openit. The spring m causes the bolt t to return to the position shown iu Fig. II. In doing this the shoulder h', act-ing on the incline h, causes the boltf to project `its inclined end d, as above described.

Having now described the construction and operal tion of' my invention, Y

What I claim as my invention, and wish secured byLettcrs Patent, is The novel combination of the plate c, nnges d and dl, inclined end dz, bolt f, slot g, screw y', incline h,

shoulder h', bolt i, slot 1:,"screw Z, spring m., stop-pin n, together with doors a, :md b, and recess for bolt iin the doorway, all working together substantially in the manner and for the purpose described.

Montreal, 1st day of November, A. D. 1870.

ANGUS MCKAY.

Witnesses:

GHARLEs LEGGE, CHARLES G. 0. SIMPSON. 

